Box steel for stove chimney

[tim_n]

Is there any downside using large gauge box steel to make a chimney for a gas bottle heater? I have a flag pole I'm going to chop down made of the stuff and figure that's better than scrapping it?

 

[Mesquite]

I can't see any problems using it apart from the weight.

Is it galvanised? If it then that's probably the only issue you might have

 

[tim_n]

Not too sure, it's covered in paint, bit rusty in places so I assume not! I can't find anything else which seems suitable unless I buy new, which goes against the grain of the project. People suggested exhaust pipes etc but they seem too small gauge.

 

[Mesquite]

Not too sure, it's covered in paint, bit rusty in places so I assume not! I can't find anything else which seems suitable unless I buy new, which goes against the grain of the project. People suggested exhaust pipes etc but they seem too small gauge.

If it's rusty it should be ok. I assume you'll be chucking the pipe in a fire to burn off the paint prior to using.

As for exhaust pipes... have a look at lorry exhausts, much larger diameter than normal car or vans.

 

[rik_uk3]

http://www.jetex.co.uk/website/jetexexhauststechnical.php

Do 3" sections half and full metre lengths

 

[ged]

RHS is fine for chimneys. The thicker the better within reason if you can cope with the weight. A flagpole should be long enough to give you a decent draught.

 

[Ogri the trog]

The extra material making up the thicker section will give a higher thermal mass - which should mean a more efficient draught once it gets warm.

Ogri the trog

 

[tim_n]

Put an ad out on freecycle, see what comes back! must be someone with a rusting lorry exhaust somewhere...!